Use a tool like ISTA+ to perform an "Initialisation of the steering" (learning end stops). This can resolve issues where the steering module has lost its calibration due to the power fluctuation. 4. Inspect Wiring Harness
In simpler terms, the car's computers are getting confusing information about how the battery is being charged, causing a system-wide alert.
After noting all fault codes, clear them from the system. Drive the car for a day or two, or through one or two drive cycles, and then re-scan. Watch to see which codes come back immediately. If the D52C44 code returns , the issue may be more isolated. However, if it returns consistently with the alternator-related code (210901) , this is a powerful indication that your alternator is the root cause. bmw error-d52c44
from the steering rack or the steering control unit (ECU). While the car may still be drivable, you might experience: JustAnswer A "Check Control" message on the iDrive screen.
If your testing points to the alternator, or if the 210901 code is persistently present, a failing alternator is your prime suspect. Often, the internal voltage regulator or communication chip fails, sending bad data on the BSD bus. Replacing the alternator with a new or high-quality OEM-remanufactured unit is the most definitive fix. After replacement, it's wise to put the battery on a charger to ensure it's at 100% state of charge before the first start. Use a tool like ISTA+ to perform an
: Ensure your battery is fully charged and holds a load. Many owners find that replacing an aging battery clears this code. Verify Alternator Output
– Load test the battery. A failing alternator (overvoltage above 15.5V) can also cause D52C44. Inspect Wiring Harness In simpler terms, the car's
To understand this error, it is helpful to look at how modern BMWs manage power.